Question: When did Pablo Casals marry Marta Casals Istomin?
Paraphrase: On what date did Pablo Casals wed Marta Casals Istomin?
SPARQL (Wikidata): SELECT ?value WHERE { wd:Q208537 p:P26 ?s . ?s ps:P26 wd:Q6774099 . ?s pq:P580 ?value}